The medical aid organization Medecins Sans Frontieres/Doctors Without Borders (MSF) has published a briefing paper about the alarming spread of drug-resistant tuberculosis, which they refer to as the "biggest threat to global health you've never heard of."Tuberculosis (TB), which is caused by Mycobacterium tuberculosis, is one of the deadliest diseases in the world, according to the US Centers for Disease Control and Prevention (CDC).Every year, around 8 million people around the world fall ill with TB, and 1.3 million die of it.

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